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PREMATUREOPTIMIZATION
The Root of ALL Evil
@akitaonrails
@akitaonrails
Rubyconf Brasil 2016 – September 23 - 24
Rubyconf Brasil 2016 – September 23 - 24
September
23 - 24 @rubyconfbr
PREMATUREOPTIMIZATION
The Root of ALL Evil
@akitaonrails
“Premature Optimization is the Root of All Evil”
- Don Knuth
SPA e-commerce
SPA e-commerce http://www.loja.com.br/#!/produtos/item-001
SPA e-commerce http://www.loja.com.br/#!/produtos/item-001
http://www.loja.com.br/?_escaped_fragment_=/produtos/item-001
High Level Numbers
Client #1
$ 4,000
$ 4,000 ($ 7 MI/yr revenue - 0.68%)
Client #2
$ 100,000+
$ 100,000+ ($ 800 MI/yr revenue - 0.15%)
• Minimum IT Cost:
• Minimum IT Cost:
• USD 1000 - Cloud Services
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:
• Revenue: > USD 2 MI / year
• Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1 “Responsible” (Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:
• Revenue: > USD 2 MI / year
• IT Cost / Revenue ratio: < 5%
Increase Revenue >
Lower Costs
Open > Proprietary (prefer “Best of Breed”)
Cloud > On-Premise (Infrastructure/Platform as a Service)
SaaS > IaaS (avoid doing yourself)
Databases
Performance
Search
Async Jobs
Monitoring
SEO & SEM (should not be Astrology!)
• /do/you/have/friendly/urls?
• /do/you/have/friendly/urls?
• sitemap.xml?
• /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?
• /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?
• No duplication duplication of content content?
• /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?
• No duplication duplication of content content?
• THEN OK!
I.
II.
III.
IV.
V.
VI.
VII.
VIII.
IX.
X.
XI.
XII.
Codebase One codebase tracked in revision control, many deploys
Dependencies Explicitly declare and isolate dependencies
Config Store config in the environment
Backing services Treat backing services as attached resources
Build, release, run Strictly separate build and run stages
Processes Execute the app as one or more stateless processes
Port binding Export services via port binding
Concurrency Scale out via the process model
Disposability Maximize robustness with fast startup and graceful shutdown
Dev/prod parity Keep development, staging, and production as similar as possible
Logs Treat logs as event streams
Admin processes Run admin/management tasks as one-off processes
y = x * 320
y = x * 320
y = (x << 8) + (x << 6)
• NO Test Suite with below 70% coverage
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down
• NO table with dozens of fields
• NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down
• NO table with dozens of fields
• NO hours to clone, setup and deploy!!
Spree: 68k LOC 40k are Specs! (60%)
Magento2: 300k LOC 127k are Specs! (< 30%)
Maintainability
> Performance
PRIORITIES!
• SQL N+1 Queries
• SQL N+1 Queries
• Too much SQL
• SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed
• SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed
• No CDN or proper HTTP Cache invalidation headers
• SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed
• No CDN or proper HTTP Cache invalidation headers
• Too much synchronous work that should be async jobs
No Metrics No Optimization
- Alan Kay
“Make it Work
- Alan Kay
“Make it Work Make it Correct
- Alan Kay
“Make it Work Make it Correct Make it Fast
- Alan Kay
“Make it Work Make it Correct Make it Fast Make it Cheap”
- Alan Kay
You != Unicorn (nor Facebook, Google, Amazon, etc)
“Casa de Ferreiro, Espeto de FERRO!”
• Increase Revenue > Lower Costs
• Increase Revenue > Lower Costs
• SaaS > PaaS > IaaS > In-House
• Increase Revenue > Lower Costs
• SaaS > PaaS > IaaS > In-House
• Maintainability > Performance
• Increase Revenue > Lower Costs
• SaaS > PaaS > IaaS > In-House
• Maintainability > Performance
• PRIORITIES!!
• Increase Revenue > Lower Costs
• SaaS > PaaS > IaaS > In-House
• Maintainability > Performance
• PRIORITIES!!
• No Metrics, No Optimization
• Increase Revenue > Lower Costs
• SaaS > PaaS > IaaS > In-House
• Maintainability > Performance
• PRIORITIES!!
• No Metrics, No Optimization
• You != Unicorn
PREMATURE OPTIMIZATION is the Root of all Evil
